Grinding machinery



Feb. 23, 1932. s. EINSTEIN ET AL GRINDING MACHINERY Filed July 22. 1926 3 Sheets-Sheet l Feb.. 23, 1932. s. EINSTEIN ET AL 1,846,956

GRINDING MACHINERY vFilel July 22, 1926 5 Sheets-Sheet 2 Sal/Mie@ s sheets-smet s erf .. :lil-4** l Guam? Feb.. 23, 1932. s. EINSTEIN ET Al. GRINDING MACHINERY' Filed July 22, 192e Sterf/@M2M .A ha

50i the spirit 'of the .in ventien.V

Patented Fehr..y 1932 sfamare frailel vFFICE i son EINSTEIN, LESTER R'NENNINGER, AND rnEnHAAs, or orNcrNNA'rI, oHro, AS-

sre-nons, BY Mnsnn ASSIGNMENTS, To `einornnArr eniunnns iNoonronA'r-nn, erf A f L CIFCINNL'GHIO, A conrDRATIoN-or omo l l Y i n GRINDNG MACHINERY f Applicationle July 22,

rI'his inyention-relates to improvements in grinding machinery and has particular reference to what is'commonly known as a center grinder.

Center grinders ormaohinesl which are intendedto grind Work held betweenwcentjers are ordinarily divided into two classes,`one 1n which there 1s a relative 1n andout movement-imparted to the Work and the grinding" 1- Wheel in 'a .feeding direction Without Aaxial d movement and the other in Whic'hleither the '3 grinding wheel. i I

Gneof the objects ofthe present invention' Work or grinding wheel has an axial shifting' movementk as for voperation upon surfaces greater in axialextent thany the Width of the selectively coupledQfor infeed ofthe partsfj or for longitudinal movement or traverse 'asV maybe preferred.

' An additional object ofthe present 'invention is the provision-'of a center 'grinding'machine `which shall have av complete automa-tlc cyelic control ofthev relative feed of the grinding Wheeland v,Work duringthe grindingoperation, togetherivith anautomatic separation ofthe Vparts ina'positive 'mannery on the completion of .thegrinding Anotherobjeot of the invention is the proi vision of ali-improved combined manual and automatic control-mechanism by Which-joint and simultaneous manual andautomatic ac'r Other objects and advantages of the presi ent inventionshould bereadily apparentby reference vto the following specification taken in connection With' theaccompanying 'draws ings and it will be understood that We may A make any modications in the specific structural4 details hereinafter'described or .illustrated Within the scope of the appended claims Without departing from Tor exceeding 192e.Y serial no. 124,249. j

' Figure 1 represents a front vievv ofa grinder, embodying KVthe invention. i Y ,j

Figure 2.I is a fragmentary vertical Ysec,- tional yievv 'as on theiline. 2-,2 of Figure 1.

Figur'ef isa sectionL through the .auto-V: mati'cjcontrol mechanism taken on line 3 3 1 of Figure 2, parts being-"broken away. VFigure 4: is a semi-sectional rear vvievv with the brokenY away parts of Figure 3 shown inV elevation... l

g Figure 5 is a View'V Vpartly in trating the drive mechanism.

section Aiilusi Figure G Visan enlarged detailedvievvjof the Control screw and adjusting 'deviceftherefori Figure a section on line' 7-.7- of Figure`3. i i 'Y i FigureS is'a fragmentary sectionalview of' the'p'ovve1``,table drive mechanism.

to. denote lcorrespondingv parts, the numeral 10 designates the ,bed of agrinder having the Ways 11 vfor the'grindingmachinetable 12.A This table 12 is, longitudinally movable on the bed in `the customarymanner and carries the driven headstock meohanismrl andthe tailstock 14. The drive and reverser mechanism for the table asl an entirety is Within the control box lfon the front of the-bed, from which extendsthe' do'g actuable reverser lever 16 for cooperation with 'dogs 17 on the table. 4These 'parts may be of any well known conventional grinding machine oonstruetion and-are not therefore believed to require morespecific description as in themselves forming vno part of thefessential novel features of thepresent invention;

i Thebed is furtherformed With the trans-V, verse Ways 18 for the carriage 19 Whichsupportsthe grinding'vvheel 20. This carriage has swivelledjthe'reto the adjusting screw 21 which eXtendsrearWardly therefrom `and has threaded thereonthe sleeve nut 22. This sleeve nut '22 is :held: against Vf1ongitu'dinal movement Vrelative the supplemental kframe 23 as by theV antifrictionV bearings Qllgandhas keyed thereon a gearlff, meshing with idler 2 6 which in ,turn is coupled by `pinion 27 with the adjusting shaft 28 Which extends to' the from; gri-iu manine.; Thisvshaagis Coupled l injure drawings in which Similar Cham@- 'i ters of-reference' areemploye'd throughout through ka suitable gear train 29 with the ratchet wheel 30. Pawl connections with reverse lever 16 serve to impart a step by step advancing movement to ratchet 30 and thus a gradual feeding in kof carriage 19 as the table 12 is reciprocated, this action being Yautomatically effected through interengagement of dogs 17 and reverse lever 16.Y In addition a handle 32is provided by which shaft 28 and nut 22 may be manually rotated. Y

To cause reciprocation of the table and thus incidentally the automatic infeed of the grinding wheel justreferred to, use is made of a drive motor 33 coupled by silent chain 34 with gear 35 on shafty 36. This shaft 1s journal'ed in a bracket bolted to the rear 0f the machine and bears av drive pinion 38.

This pinion is in perm'anentdriving vmesh Iwith gear 39 of slidinggear transmission shaft 40, supported bythe supplementall frame member 41. Shaft 40 bears pulley 42 adapted to be coupled with thelcoolant pump which is thus continuously driven at a constant rate of speed.YK Journaled in the frame 1 ing Wheel `41is ka second transmission shaft'43 bearing a xed gear transmission unit 44 and a sliding unit 45 which is splined thereon. Y Unit 45 is adapted for coaction with fixed unit 46 'on shaft 40, while unit 4f4is adapted for cooperation'with the splined sliding lunit 47 of shaft 40, said gear changes being effected through dial lever' 96 and suitable associated control mechanismkof the type shown. for eX- ample inUnitedfStates Letters Patent 1,490,- 894. ."It will thus be seen that shaft 43 may be selectivelydriven'from shaft`40 as illustratedy at six, different speeds. Shaft 43 is. further provided witha-bevel gear l48`me`sh1ng with a second bevel gear 49`on; shaft 50 which eX-VV reciprocation of the parts lis unnecessary and a direct feeding motion-may be employed, this action isalso eected through shaft 43. The frame 41 has a bushed boss as at 55, while within the bushingh56 is a rotatably supported sleeve 57 interiorly interlocking with the splines on shaft' 43 Vand at 'its distant endhaving'fthe Yclutch face 58 for cooperation with clutch 59 slidably supported by ,shaft 60. A bushing l61 within sleeve 57 Vforms'a bearing for one end of'shaft 60, while the opposite end is `j ournaled in theframeV member 23. This shaft bears a worm v62 meshingk thereto disk 64 provided with the cam path 67 receiving roller 68`of` toggle mechanism 69.* One end of the toggle is pivoted to a stud 70 carried by frame 23, while the other end ofthe toggle isvpivoted to an arm 71 of sleeve 72 which has a spline 73 riding in keyway 74 of adjusting screw 271.- It will thus Y be seen that when rotation is imparted to disk 64, cam' path 67 Vwill cause an up Vand down movement of toggle 69, thus rotating sleeve 72 and with it shaft 74. This rotative action of the shaft with nut 22 held stationary willcause a predetermined in and out movement of carriage 19with respect to the worktable. Attention' is invited to the factthat the cam as shown Yin Figure 4 rotates in a counter-clockwise direction. It is shown at substantially the inception of ay cycle of movement orwith the carriagecontrolledthereby in retracted position. As the cam rotates,

`arm 71 will be drawn downward, rotating the control screw to move the carriage inv'vard'at a slow 'rate during substantially Va half a revolution, at the end of which period the cam has asubstantially concentric portion, causing a dwell in the grinding wheel for spark-k' ing out orflinal finishing tosize.' At the end of this dwell will be found asharp rise. on

they cam causing ,a quick return movementof the carriage, withdrawingy the. .grinding wheel from engagement withthework piece.

VReferring particularly to g the control Vclutch having the cyclic movement, the clutch member 59 is shown as formed with the spool portion 75 engaged by shifter yoke 76 having Aan upstanding arm 77', connectedfby link 7 8 withone arm 79 of 'ya bell crank havinga second'angular arm 80 provided .with a contact'roller281.` This'bell crank is supported for rocking movement byshaft 82Awhich`eX- tends to the front Vof the machine, andits roller81 is urged byia spring 83 against theperiphery of control disk'64. As thedi'sk rotates, notch 85 infitsfedg'e will allowl roller 81 'to snap inwardunder the Yinfluence of Vwith the worm gear 63 onhub 65 rotatably Y supported by aXle 66. Thishub has secured spring 83. This inward'm'ovement by rock- K ing of the'bell crankan'dpull on link 78 swings the shifterv yoke to disengage clutch members 58 and 59, thusstopping rotation of the cam disk 64. f '-f* When it isV desired'to start upthe machine again, -shaft 82 is rocked by handle 86 on the front ofthe machine to .lift roller 81 out of notch 85 andthrow the clutch members into engagementz- Rotation of disk 64 then brings Y its periphery into engagement with roller 81 holding the'clutch locked infengaging position until a new cyclerhasbeen performed.y

It vwill of course be understood that con-y trol levers51-and 86 are selectively actuated,

either member 51 being shifted to render its clutch inoperative to prevent. reciprocation of theztable or lever 86 left in'position so thatl long work pieces performed.

roller 81 interlocks with notch 85, Vso that there is no automatic `infeed and return stroke of the carriage in the event that the grinding on table `is being reciprocated and In order that several parts of the gear mechanism may -be properly lubricated,use is made of a plunger pump 90 shown in Figure 5, actuated by a cam 91 on shaft 36.

`In the operation of the machine power is applied as. froml the motor or other prime km'over 33 through shaft 36 toshaft 40 and thence through the speed determining transmission gears to shaft 43.* Shaft 43vmayf of the table isentirely selectively controlled by shift lever 51 and clutch 92.

ln addition the variable rate power imparted to shaft 43 maybe coupled through clutch 59 with worm 62. vThis worm ,drivescam disk 64 and through the action of cam t track 67 on towrle nmechanism 68 rocks or oscillates the non-translatable Vsleeve 72 slidably keyed on screw 21. Oscillation of the screw on account of its threaded engagement in non-translatable nut 22 produces a limited in and out movement of the grinding wheel and a consequent predetermined removal of stock from the work and subsequent disengagement of the work.

Nut 22 is also coupled through gear'25 and other associated gearing with shaft 28 manually actuable from the front of the machine. Inasmuch as the power actuation effects the screw only for definite back andV A forth shiftingsof the grinding wheel carriage while the manual actuating mechanism operates upon the other member both of these may be simultaneously operatedto vary the position of thegrinding carriage for, reciprocations of the samexamplitude as determined by .the oscillation of. the sleeve and screw through` cam` 67. Through employment of clutches 59 and 92 it is therefore possible to selectively couple the grinding wheel Y carriage for positive in and out feeding movement of prescribed Vamplitude or the table with the table feed mechanism for recipro- Y cation of the table past the grinding wheel. From the foregoing description it will be seen there has been provided an improved machine for center grinding of cylindrical articles in which the work carriage itself maybe reciprocated to axially shift the work past the surface of the grinding wheel and the feed of the wheel manually Veffected or autoy' matically effected during the reciprocation of the table orwhich may be automatically em-XV ployed forldirect infeed grinding. It Will furtherbe noted that when so selectively employed there is' provided a cam control mechanism-operable from the same source of power feed mechanism and which will serve to automatically accomplish a complete cycle of movement of the grinding wheel,-comprising a slow infeed, a dwell for sparkingout purposes and a positive accelerated return movement ofthe grinding wheel. Ithwill also be noted that themechanism issuch that the `position ofsthe grinding wheel-may be manuallyadjusted to increase either its inward or outward movement irrespective of whether '7c `as the table reciprocating and intermittent the intermittent or automatic feed devices are being operated.

We claim l f 1. A grinding machine including aA bed, aitable reciprocable on rthe bed, a grinding wheel 'carriage movable in Ya direction atrightangles to the direction of movement of the table, a power'shaft, means for imparting a Y single in and out movement tothe grinding, Y

wheel" carriage toward the table, means for shifting Y the table, vand control devicesfor selectively coupling the carriage actuating or table actuating means withthe power shaft.z n

1 2. A vgrinding machine including a bed,va

wheel carriage movable in a direction at rightV angles to thev direction of movement ofthe single in" and out'movementto the grinding wheel carriage toward the table, means for shiftingzthe table, control devices for selec-l K tively coupling the carriage actuating vortable Y actuating means with the power shaft and means for varying the eiectiverate of speed transmitted from. the power shaft to either of the shifting means.

Ytable', a power shaft., ymeans forimparting a i 3. A cylindrical grinding machine includf Y inga bed, work supports carried thereby, a

V.grinding wheel carriage slidably mounted on the'bed, a feed screw rotatably but non-translatablyisecured to the carriage, a rotatable Vnon-translatable nut engaged onthe screwV for imparting an in and outmovement to the screw and carriage upon rotation of the nut, manual means for rotating'the nut to vadjust the position of the carriage, and cam controlled means for rotating the screw within the nut to impart.l a supplemental move-` mentto the carriage. Y

4. A grinding machine of the type described, including a bed or support and a grinding lwheel carriage slidably mounted thereon, VaV nut and screw device `coupled with the carriage for impartingin and out movement thereto, and control means for said in and out-movement, including a power actu- Y ated cam member, toggle connections between the cam andthe screw vand'nut mechanism for y producing an in and out movement of the car- 95 Vtable.,reciprocable.on the bed, a grindingV Y wheel carriage disposed in opposition to theV 'riage`,a Yclutch in the power transmission line,"

in'eansfor. initially engaging saidclut'ch to rotatethe cam, coacting means. on the cam andclutch mechanism forholdingthe clutch in operative position, and means for shifting the clutch into inoperative vposition at a predetermined point in the movement of the cam. 5. A grinding machine of the character described, including as. bed, a table supported for reciprocation on the bed, workholding members carried by the table, a grinding table and movable-in a direction toward and fromthe table, ascrew coupled with the carriage 'for controlling the movement thereof, a driven sliaft,connect1ons between-1 the driv-V f en shaft and table for'reciprocating the latter, cooperating connections between the ta` Able and screw for actuating the latter to bed, a. grinding wheel carriage mounted for move thecarriageinward as the'table recip- Yrocates andadditional selectively engageable movement toward and from theztable, means oli-the front of the machine actuable by reciprocation of the table for impartinganin- `ward feeding movement to the grinding wheelcar'riage, and means on the rear of the bed-for imparting a. cyclic inand outstroke tothe grinding wheel carriage.

7. A cylindrical grindng machine 'includ'- ing a. bed, a table reciprocably mountedon the 'beda grinding A.wheel carriage mounted vfor#movement toward land fromv the table,

means on the front of the machine actuable byreciprocation of the table for. imparting an inward feeding movement to the Orinding wheel carriage, means on the rear of the bec for imparting a. cyclic in and out stroke to the grinding wheel', power driven mechanism..

.for actuating said means, and control dev'ice"'foir lin iting said actuatioirtofa single stroke. l

8. 'A cylindrical grinding machine including a bed, a table reciprocably mounted on the bed, a grinding wheel carriage mounted for movement toward and fromthe means on the front of the machine actuablerby're-V ciprocation of the table for imparting an inwardV feeding movement to V`the grinding wheel carriage, means on therear o-f the bed I forimparting a cyclic in and out stroke to the. grindingl wheel carriage, power .driven mechanism for actuating said means, a control 'device for limiting-saidV actuation to a single stroke and manually operable means at the front of the machine for'initiatingsaid power stroke ofthe carriage.

V9.V In a cylindrical grinder the -combinaition with a bed and a grinding wheel carriage Vmounted. forreciprocation on the bed, of

screwmechanisni for adjusting the position ofthe carriage on theV bedV and additional powermechanism for imparting an in and out movement to the carriage, ,said mechanisinvincluding a sleeve splined on the screw, a toggle mechanismco-nnect-ed with the sleeve and'having a cam follower, a rotatable disk having an eccentric cam path receivingthe follower, and having a notch in the edge thereof, power means for rotating the disk, a control 'clutch for coupling the power means with thedisk, `and clutch shifting members, including. a follower peripherally engaging the dislrandV a spring ,for shifting the clutch intoy inoperative position upon engagement of the follower in the notch of the disk.

10. 'In *a grinding machine the combination with a bed or support ofa grinding wheel carriage reeiprocably mounted thereon, and means for. imparting 'movement to said carriage including a feed screw coupled therewith, a vnut engaged on the screw and held by' the support against axial movement, nieansfor rotating the nut to cause afeeding movementof the carriage in a direction determined 'by thel direction vof rotation of the nut,a`nd additional means for imparting an `independent,rotary movement Ato the screw to supplement the'actionof the nut ingthe carriage.' y

11.` A grindingv machine of the character described including a bed or support, a grinding wheel carriage 'slidably mounted thereon, and means for controlling the position of the grinding wheel carriage including inter-engaged.V screw and nut members, one of said in adjust- 'members being coupled tothe grinding wheel carriage against axial movement Vrelative tures.

son EINSTEIN. LESTER r. NnNNiNGnn.

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